不同C/N对草鱼池生物絮团的形成及水质的影响研究

为了研究草鱼池生物絮团形成所需的适合C/N,实验分析不同C/N水平对水泥池中生物絮团的形成、水质及草鱼生长的影响。对照组投喂基础饲料(C/N为10.8∶1),实验组在基础饲料上添加葡萄糖,控制C/N分别为15∶1、20∶1和25∶1。结果显示,当C/N≥15时,形成的生物絮团可以有效的调节水质,降低水体中的氨氮、亚硝酸盐氮水平;各组的生物絮团体积指数(FVI)随养殖时间逐步增加,在第14天趋于稳定;随着C/N增高,尽管实验组水体中形成的生物絮团粗蛋白含量显著高于对照组(P<0.05),但是草鱼生长却呈下降趋势。综合而言,生物絮团技术应用于草鱼养殖适宜的C/N为15,该比值能促进生物絮团的形成,并能有效降低水中的氨氮、亚硝酸盐氮水平。

Effect of C/N ratio on Biological floccules formation and water quality in zero-water exchange grass crap tanks

Biofloc technology used in shrimp and tilapia aquaculture reflects the feed coefficient decreased water quality environment to improve and accelerate the growth of the combined effect of the technology widely farmed in China cyprinids how the application effect has not been reported. Study of different C/N level of the bioflocs formation, water quality and growth of grass carp. A locally formulated and prepared feed containing 30% crude protein with C/N ratio 10.8 was applied to all ponds. In order to raise the C/N ratio of the feed input to 15, 20 and 25, glucose was applied separately as a source of carbohydrate in addition to the artificial feed. The results show that when the C/N is over 15, the biofloc can effectively regulate water quality, reduce water of ammonia, nitrite concentration; each group the biofloc volume the index (FVI) with gradual increase in breeding time, stabilized in Rule 14d; With the C/N increased, the biofloc groups formed in the water content of crude protein was significantly higher (P <0.05) than control groups, but the growth of grass carp shows a decreasing trend. Overall, biofloc technology used in the breeding of grass carp appropriate C/N of 15, the ratio can promote the biofloc formation, and can effectively reduce ammonia nitrogen, nitrite nitrogen levels.